Russian gas monopoly Gazprom has boosted its estimate of recoverable gas resources at the Leningradskoye field in the Kara Sea by about 840 billion cubic metres.

Natural Resources & Environment Minister Sergei Donskoy said Gazprom submitted a request to authorities to approve the resource upgrade after interpretation of the results of an appraisal well drilled on the field in summer 2017.

The well was drilled to a depth of 2000 metres in order to confirm anticipated gas reserves following gathering of extensive 2D and 3D seismic between 2014 and 2016.

Leningradskoye was discovered in 1990. Two wells drilled on the structure resulted in a preliminary assessment of its recoverable reserves of about 1 trillion cubic metres of gas and 23 million barrels of condensate.

The new estimate would increase its gas resources to 1.85 Tcm.

Despite a reserves upgrade, Gazprom will not decide on a development schedule for Leningradskoye until it has completed appraisal drilling at the nearby Rusanovskoye field.

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Gas boost in Kara Sea